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Adjacent angles
Their angles of intersection are the same, and the angles facing each other are supplementary.
Perpendicular Lines form right angles at their point of intersection
Perpendicular lines
The angles opposite one another at the intersection of two lines are called vertical angles. Vertical angles are always equal in measure, meaning that if one angle measures 40 degrees, the angle directly opposite it will also measure 40 degrees. This property is a result of the way the lines intersect, creating pairs of angles that are congruent.
They are said to be perpendicular. Or, if you wanted an example of a pair of such lines, one example is a plus sign.
Perpendicular lines
Perpendicular lines
Perpendicular lines
Lines that intersect to form right angles at their point of intersection have slopes that are negative reciprocals.
Intersection or perpendicular lines.
perpendicular lines